Two-cycle multicylinder internal-combustion engine



c. HANocQ TWO-CYCLE MULTICYLINDER ISTERNAL COMBUSTION ENGINE Jan. 1?,1928.

Filed Feb. 12. 1926 Patented 3m. i1, 192s.

rural) STATES PATENT oFFcE.

CHARLES HANOCQ, OF BRUSSELS, BELGIUM.

Application filed February The present invention consists essentially in providing a multi-cylinder two cycle internal combustion engine having double inclined V cylinders, the axes of which are angularlydisplaced around the axis of rotation of the crankshaft so that suitable timing is obtained between the admission and exhaust periods, in order to not only enable the cylinders to bewell filled without wasting the mixture but also to insure a very perceptible over compression with a suficiently' high inlet pressure. In addition, the inlet and exhaust ports are shaped and placed so as to cause the burnt gas to be scavenged energetically and to produce a rarefaction in the cylinders facilitating the admission of fresh gas.

According to this invention, a main connecting rod connects the piston of one of the double cylinders to the crank pin}, while an auxiliary connecting rod connected to the piston of the other cylinder is also connected to the said main connecting rod.

A special crank in is provided with two journals slightly 0 set relative to each other,

1 and each connected to one of the two con necting rods.

The examples of forms of construction are represented diagrammatically in the accompanying drawings in which,

Fig. 1 shows a section of a double cylinder engine with two connecting rods connected to the crankpins of the crankshaft.

Fi 2 is a reduced scale section taken on the line 22 of Fig. 1, in order to show the arrangement of the inlet and exhaust ports.

Fig.3 shows a crankpin with two journals in line for connecting the two connecting rods.

Fig. 4 shows a crankpin with two journals ofiset relative to eac other.

Fig. 5 is a cross section of the common combustion chamber showing .the special shape of this chamber facilitating the filling and the scavenging, caused by the whirlting motion of the gas.

in the different figures, the same reference letters designate the same or analogous parts.

As shown in Fig. 1, ,the relative inclination oi the axes of the two cylinders forming a ll" set is selected so as to obtain suitabie timing between the admission and exhaust periods, and also so that the point@ atwhich the auxiliary connecting rod from 12, 1926. Serial No. 87,897.

the right-hand cylinder (3 is pivoted to the main conn'ectin rod from the left-hand cyl inder 0 will e situated as close as .possible to the dead center, when the said lefthand cylinder connecting rod is at the top .ture 1s drawn 1n, only commences at A Because of the angle between thev cylinders around the crankshaft axis, the inlet port will be closed at A while the exhaust port will have been shut at 6 This not only enables the double cylinder of each set to be very completely filled with gasbut also permits a very perceptible increase over compression to be obtained provided that the available admission pressure at the inlet port a be suificiently high.

The eflicacyl of the distribution obtained correctly by the combined action of the two pistons forming an angle with each other about the center of rotation is rendered complete by the arrangement-and the shape of the inlet and exhaust ports and passages, as shown in Fig. 2. The inlet passage a is'composed in this case of two or more converging nozzles, while the exhaust passage 0 is formed by two diverging nozzles, the said nozzles being directed to the top of the corresponding cylinders and tangentially to its circumference so as to produce a whirling motionof the gas having the effect of fa cilitating the complete and energetic scavenging of the dead gas. The transverse shape of the head. common to the two cylinders in the same set andshown especially in Figure 5 further facilitates the production ofsuch whirling motion.

Under the action of the transformation of the kinetic energy into potential energy, the diverging exhaust nozzles 6 will have the effect of causing a rarefactionin the double cylinder during the admission period. The entrance of the fresh mixture will thus be facilitated and the pressure required for the admission can be consequently reduced.

The number of inlet and exhaust nozzles a and a can be as large as is suitable for insurmg the best filling and scavenging conditions in each double cylinder.

The two connecting rods are absolutely identical and have a sim le shape, but the ineonveniencecaused by t e dead {centers not ocou simultaneousl for the two pistons may be accentuated. order to'avoid 'or attenuate the inconvenience of the nonsimu-ltaneous occurrence of the dead centers of the two cylinders the invention provides an ar ent which consists inofis'ettingone of t e parts 0 of the crank pin shown in 8 relative to the other part 0,.

, uch an arrangement is shown in Fig. 4.

. In the case of air cooled engines and rincipally for'engines' designed for airp nes, the inventionprovides t at two sets of douso 'ble cylinders inclined in V and having their formin an angle alon the ion 'tudiaxis of t e crankshaft w ch will e distributed'radially around said crankshaft so to assure a convenient cooling of all cylu inden.

1,ese,u1

What I claim in A two cycle internal combustion engine having two inclined V-cylinders, the axes of which form an angle with each other, a combustion'chamber connect the inner ends of said cylinders, said cham r having a concave side wall and a convex side wall between said cylinders-so that a curved passa way is formed by said combustion chamber tween the inner ends of said cylinders, one of said cylinders having a plurality of air intake ports arranged tangentially with respect thereto and narrowing toward said c linder and also inclined toward said com nation chamber, the other cylinder having an plurality of diverging exhaust passages inclinedin the op ite direction from said intake ports an also arranged tan ntially with respect to the last named cylin er, said intake and exhaust ports and said combustion chamber coatmg. to cause the gases in said cylinders and combustion chamber to whirl as they ass therethrough.

In witnesa'w ereof I afix m signature. I

CHARLES OCQ 

